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RAID1 + iSCSI as backup (was Re: More RAID weirdness: external RAID over network)

From Gregory Seidman <gsslist+debian@anthropohedron.net>
Newsgroups linux.debian.user
Subject RAID1 + iSCSI as backup (was Re: More RAID weirdness: external RAID over network)
Date 2023-03-17 21:00 +0100
Message-ID <Gaop3-daS3-3@gated-at.bofh.it> (permalink)
References (1 earlier) <GafYt-d5tV-5@gated-at.bofh.it> <GahQE-d6Es-3@gated-at.bofh.it> <Gajpn-d7JR-3@gated-at.bofh.it> <Gajz3-d7NH-11@gated-at.bofh.it> <Gak25-d8fW-3@gated-at.bofh.it>
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On Fri, Mar 17, 2023 at 06:00:46PM +0300, Reco wrote:
[...]
> PS There's that old saying, "RAID is not a substitute for a backup".
> What you're trying to do sounds suspiciously similar to an old "RAID
> split-mirror" backup technique. Just saying.

This thread has piqued my interest, because I have been lax in doing proper
backups. I currently run a RAID1 mirroring across three disks (plus a hot
spare). On top of that is LUKS, and on top of that is LVM. I keep meaning
to manually fail a disk then store it in a safe deposit box or something as
a backup, but I have not gotten around to it.

It sounds to me like adding an iSCSI volume (e.g. from AWS) to the RAID as
an additional mirror would be a way to produce the off-site backup I want
(and LUKS means I am not concerned about encryption in transit). It also
sounds like you're saying this is not a good backup approach. Ignoring
cost, what am I missing?

> Reco
--Gregory

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Thread

More RAID weirdness: external RAID over network Nicolas George <george@nsup.org> - 2023-03-17 11:10 +0100
  Re: More RAID weirdness: external RAID over network Reco <recoverym4n@enotuniq.net> - 2023-03-17 12:00 +0100
    Re: More RAID weirdness: external RAID over network Nicolas George <george@nsup.org> - 2023-03-17 14:00 +0100
      Re: More RAID weirdness: external RAID over network Reco <recoverym4n@enotuniq.net> - 2023-03-17 15:40 +0100
        Re: More RAID weirdness: external RAID over network Nicolas George <george@nsup.org> - 2023-03-17 15:50 +0100
          Re: More RAID weirdness: external RAID over network Reco <recoverym4n@enotuniq.net> - 2023-03-17 16:20 +0100
            Re: More RAID weirdness: external RAID over network Nicolas George <george@nsup.org> - 2023-03-17 16:30 +0100
              Re: More RAID weirdness: external RAID over network Dan Ritter <dsr@randomstring.org> - 2023-03-17 17:10 +0100
                Re: More RAID weirdness: external RAID over network Nicolas George <george@nsup.org> - 2023-03-17 17:10 +0100
                Re: More RAID weirdness: external RAID over network Tim Woodall <debianuser@woodall.me.uk> - 2023-03-17 18:00 +0100
                Re: More RAID weirdness: external RAID over network Greg Wooledge <greg@wooledge.org> - 2023-03-17 20:10 +0100
                Re: More RAID weirdness: external RAID over network Nicolas George <george@nsup.org> - 2023-03-17 21:50 +0100
                Re: More RAID weirdness: external RAID over network Nicolas George <george@nsup.org> - 2023-03-17 22:00 +0100
                Re: More RAID weirdness: external RAID over network Tim Woodall <debianuser@woodall.me.uk> - 2023-03-17 23:50 +0100
                Re: More RAID weirdness: external RAID over network Nicolas George <george@nsup.org> - 2023-03-20 11:50 +0100
            RAID1 + iSCSI as backup (was Re: More RAID weirdness: external RAID  over network) Gregory Seidman <gsslist+debian@anthropohedron.net> - 2023-03-17 21:00 +0100
              Re: RAID1 + iSCSI as backup (was Re: More RAID weirdness: external  RAID over network) Dan Ritter <dsr@randomstring.org> - 2023-03-17 22:10 +0100
              Re: RAID1 + iSCSI as backup (was Re: More RAID weirdness: external  RAID over network) David Christensen <dpchrist@holgerdanske.com> - 2023-03-18 02:10 +0100
                Re: RAID1 + iSCSI as backup (was Re: More RAID weirdness: external  RAID over network) Gregory Seidman <gsslist+debian@anthropohedron.net> - 2023-03-18 03:30 +0100
                Re: RAID1 + iSCSI as backup (was Re: More RAID weirdness: external  RAID over network) David Christensen <dpchrist@holgerdanske.com> - 2023-03-18 09:10 +0100
                Re: RAID1 + iSCSI as backup (was Re: More RAID weirdness: external  RAID over network) Dan Ritter <dsr@randomstring.org> - 2023-03-19 02:40 +0100

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